To evaluate the effect of planting date and weed interference on growth analysis of red beans cultivars a factorial split plot experiment in randomized complete block design with three replications was carried out in the Research Field of Zanjan University. Main plots included of three levels of red bean varieties (erect cultivar (Derakhshan), half-erect cultivar (Sayyad), creeping cultivar (Goli)) and planting dates at two levels,( 30th of May and 13th of June) and subplots included of weed interference (weed infested and weedy check). Analysis of variation showed that the difference of cultivars in most traits were significant . The weed interference had significant effect on all traits except for seed weight and harvest index. Sowing date, were not significantly different in all traits. The highest grain yield and total dry matter had the Goli cultivar and Derakhshan cultivar. Finally, based on the results of this study the Goli cultivar due to higher performance in both planting dates can be recommended

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